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I am assuming you are referring to a conventional stove. First shut off power to the stove at the breaker panel. (either a 40 or 50 amp breaker). Check to see if the elements come on before proceeding. Slide out stove and unplug it. Look on the back. There will be a vertical piece of sheet metal with 1 to 3 screws or a large flat panel with several screws (1/4 Inch socket). Remove this panel to reveal the leads to the bake element. remove the leads. Then remove the two screws inside the stove (1/4 inch socket) to remove element. The model and serial for the stove should be located by sliding the drawer out at the bottom of the stove on the left side. You will need this number for the correct element. They run about 20 dollars typically. Hope this helps.

Depending on the full model number (from the tag in or on the unit, something like JVM1860SD003, etc.) there will be one or more thermostats / thermal cutouts / TCOs which can open if overheated.

There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating
components.

Also at
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.

You can find
helpful exploded view diagrams and order parts by entering your full
model number here.

Any TCOs you need to be concerned with will have thicker wires. The one with thinner wires will read different form the others, and that is normal. See the mini manual for details.

We're
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.

Yes, there is a light on the right hand side of the microwave (looking at the control panel). It is located directly behind the control panel and may be seen with a flashlight looking inside the door through the perforated metal housing. Four special hex-with-stem screws must be removed from the cover to access it, along with one standard Phillips head screw on the side. Once the screws are removed you must slide the cover toward the back about 1/2" before it will be able to tilt up and be removed.

For safety reasons make sure to unplug the unit and allow it to discharge before removing the cover. Also make sure to not touch anything you aren't intending to work on - it could be carrying power from the capacitor, which is like a battery, and might not be discharged while you are poking around inside.

I am currently seeking out a replacement lamp for mine. I could not find one at any of the local hardware stores as this has a proprietary base and the bulb is not removable from the base. I will be looking on ebay and elsewhere.

There should also be a "mini-manual" hidden inside the unit behind the control
panel or hidden on the left side behind the grille, which is very
helpful when troubleshooting, & testing.

At
our Web site, we have a video available showing how to remove a typical
over the range control panel assembly in under 5 minutes.You
can download Whirlpool owner's manuals and installation instructions (very handy when removing the oven form the wall for parts replacement) here.

There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.

At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.

You can usually find
helpful exploded view diagrams and order parts by entering your full
model number here.

It may be the fuse, or the magnetron thermostat (thermal cutout ./ TCO) or the oven cavity thermostat.

The first two can be accessed via the control panel opening, but if you
need to check or replace the oven cavity thermostat, you will need to
remove the oven form the wall.

Removing it from the
wall is
ideally a 2-person job and you should have your installation
instructions handy. If not, you should be able to find it here.

Be sure to unplug the oven before you begin.

We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.